diff_formatter.go RawHistoryFolder

1package config
2
3import (
4	"fmt"
5	"strings"
6
7	"github.com/bnema/dumber/internal/application/port"
8)
9
10const noChangesMsg = "No changes detected."
11
12// ConfigDiffFormatter implements port.DiffFormatter for formatting config changes.
13type ConfigDiffFormatter struct{}
14
15// NewDiffFormatter creates a new ConfigDiffFormatter.
16func NewDiffFormatter() *ConfigDiffFormatter {
17	return &ConfigDiffFormatter{}
18}
19
20// FormatChangesAsDiff returns changes formatted as a diff for display.
21func (*ConfigDiffFormatter) FormatChangesAsDiff(changes []port.KeyChange) string {
22	if len(changes) == 0 {
23		return noChangesMsg
24	}
25
26	var sb strings.Builder
27	sb.WriteString("Config migration changes:\n\n")
28
29	for _, change := range changes {
30		switch change.Type {
31		case port.KeyChangeAdded:
32			fmt.Fprintf(&sb, "  + %s = %s\n", change.NewKey, change.NewValue)
33		case port.KeyChangeRemoved:
34			fmt.Fprintf(&sb, "  - %s = %s (deprecated)\n", change.OldKey, change.OldValue)
35		case port.KeyChangeRenamed:
36			fmt.Fprintf(&sb, "  ~ %s -> %s\n", change.OldKey, change.NewKey)
37			fmt.Fprintf(&sb, "    (value: %s)\n", change.OldValue)
38		}
39	}
40
41	return sb.String()
42}